elojuhla 2016 Sasha Hoshian

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Text of elojuhla 2016 Sasha Hoshian

Nano Replication for Hybrid Elastomer/Metal-Oxide Surfaces

Elojuhla presentation31st August 2016Sasha.hoshian@aalto.fiDepartment of Materials Science and Engineering & Micronova Centre for Nanofabrication, School of Chemical TechnologyExoskeleton for Robust Superhydrophobicity8/23/20161

Superhydrophobicity in Nature

8/21/20162

8/23/20163

Some applications

8/24/20164How does it work?

12Surface structuresSurface Chemistry

Air layer

8/23/20165Which one is more important?

Surface structures vs Surface Chemistry

ACS Appl. Mater. Interfaces,2015,7(1), pp 941949

ACS Appl. Mater. Interfaces,2015,7(28), pp 1559315599

Socrative Question8/21/20166Which structure works better to repel liquids?

ABC

B is correct6

Are they robust enough?

12438/21/20167

5

6

8/21/20168Exoskeleton argument

8/23/20169Hybrid of PDMS/titania

ALD titania Aluminum template/titania

Replica PDMS/titania

Soft Matter, 2016,12, 6526-6535, DOI:10.1039/C6SM01095DAluminum template/titania

Curing PDMS

8/24/201610PDMS/Titania Superhydrophobicity

wine coffee waterPDMS/titania

advancingrecedingRolling angle 5

PDMS/titaniabloodThanks to Esko Kankuri

PDMS/titaniasalivaThanks to myself

10

8/21/201611Robust superhydrophobicity due to exoskeleton titaniaTry me

Knife scratches

8/21/201612Non-planar superhydrophobic surfacesFuture plans

Curing PDMS ALD titania on etched aluminumMicroscopic view inside of tubesPDMS/titania

Curing PDMS between two tubes, inner tube is etched with HCl and coated with ALD titaniaSacrificial etching of aluminum tubes

a)b)

AluminumAluminum etching

Blood in PDMS vs PDMS/titania tubes8/22/201613

Reference PDMS tubeSuperhydrophobic PDMS/titania tube

8/22/201614

Keep calm&mimic NATURE